<template>
     <!-- 添加背景颜色 
     添加字体颜色
     添加选中颜色 -->
  <el-menu
    default-active="1-4-1"
    class="el-menu-vertical-demo"
    @open="handleOpen"
    @close="handleClose"
    :collapse="isCollapse"
    background-color="#545c64"
    text-color="#fff"
    active-text-color="#ffd04b"
  >
  <h3>{{isCollapse ? '后台':'通用后台管理系统'}}</h3>
    <el-menu-item @click="clickMen(item)"  v-for ="item in noChilden" :key="item.name" :index="item.name">
      <i :class="`el-icon-${item.icon}`"></i>
      <span slot="title">{{ item.label}}</span>
    </el-menu-item>

    <el-submenu v-for="item in hasChilden" :key="item.label" :index="item.label">
      <template slot="title">
        <i :class="`el-icon-${item.icon}`"></i>
        <span slot="title">{{ item.label }}</span>
      </template>
      <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
        <el-menu-item @click="clickMen(subItem)" :index="subItem.path">{{ subItem.label }}</el-menu-item>
      </el-menu-item-group>
    </el-submenu>
  </el-menu>
</template>

<style lang="less" scoped>

.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
  
}
.el-menu{
    height: 100vh;
    h3 {
        text-align: center;
        line-height: 48px;
        color: beige;
        font-size: 16px;
        font-weight: 400px;
    }
}
</style>
  
<script>
import Cookie from "js-cookie"
export default {
  data() {
    return {

    };
  },
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath);
    },
        //点击菜单
    clickMen(item){
    console.log(item)
    //当页面的路由与跳转的路由不一致的时候才允许跳转 this.$route 当前路由
    if(this.$route.path !==item.path && !(this.$route.path ==='/home' && (item.path ==='/'))){
        this.$router.push(item.path)
     }
     //从store.commit中获取数据
     this.$store.commit('selectMenu',item)
    
   }

  },
  computed: {
    //没有子菜单
    noChilden(){
        return this.menuDate.filter(item => !item.children)
    },
    //有子菜单
    hasChilden(){
        return this.menuDate.filter(item => item.children)
    },
    isCollapse(){
      return this.$store.state.tab.isCollapse
    },
    menuDate(){
      //判断当前数据，如果缓存中没有，当前store中去获取
      return JSON.parse(Cookie.get('menu')) || this.$store.state.tab.menu
    }
  }

};
</script>

<style lang="less" scoped>
.el-menu{
  border-right: none;
}
</style>